Utility knife



FIG. 1 is a perspective view of a utility knife, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is bottom plan view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken lines in FIG. 1 are used to show environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a utility knife, as shown and described. 